:category:astronomy
{{CatDiffuse}}
{{Infobox library classification}}
{{Commons category}}
{{Wiktionary category 2|Astronomy}}
{{Portal|Astronomy}}
{{Cat main|Astronomy}}
Astronomy is a science involving the observation and explanation of events occurring outside Earth and its atmosphere. It includes the study of the origin, evolution, and physical and chemical properties of objects that can be observed in the sky, space, and in the whole universe.